Funny thing, i was in that situation last year. I just turned 14 in september and last year my dad was going to get another kdx or give me his. I ended up sticking it out with my 125 and now i have a crf. KDX will be a great bike... i wouldnt do any mods until he rides it for a year or so and then pipe silencer and you'll be set!

Ive never been to a track, but the kind of jumps i hit (lips on top of hills etc) but what determines how you jump is speed entering the jump and however much throttle you give off of the lip. Like for instance i climb the hill in 3rd and burp the throttle at the top and the mix of those two things launches me and then i adjust with brake or throttle.

a 85 will wake him up off a klx140.... 105 might be too much
I've wanted to race for a while but i cant talk my dad into it. Im 14 ive been riding a full size bike for almost 4 years but he still wont let me.

BEWARE: This is my first thumper so if i sound dumb or overlook somthing obvious, please tell me.
Alright so the trusty 05kx125 was sold and we bought a 05 250r from my dads friend. We havent been able to start it cold at all, only once. Once i pop it and warm it up, rarely it'll fire up just kicking, sometimes it'll fire up from pulling hotstart and holding half throttle, sometimes it'll fire if you whack the gas as you kick..... when im kicking through slowly i cant feel tdc at all. It dosent feel like it gets harder at any point in the stroke, maybe its cause i have boots on but i think it might be the valves out of spec. It has a High compression piston and a hotcam. im not allowed to ride for the rest of the year but what from ive read on here theres a couple things i think it might be.
-I read that if it pops on decel that you need to turn the fuel screw out or change the pilot but theres no fuel screw at all on my carb.
-The valves could be out, i think its partly this because i cant feel tdc at all.
-My dads mechanic friend thinks that the accelerator pump may be gummed up a bit because it sat a lot rarely getting ridden, but it runs like a top once you get it fired.
<--- me after kicking and it not starting.

http://tinypic.com/view.php?pic=2ni04n5&s=7
Before i washed 'er
Black excels/red talons
RG3 Triple clamps
ASV's
Full Yoshi system
High Comp Piston
Hotcams
Now i just need to figure out how to start her cold...... Have to pop start cold. I guess those are the rigors of your first four stroke